any force responsible for maintaining an object on a curved path around a fixed center. In introductory coursework this is usually "uniform circular motion" and yields several simple and useful relations. Not to be confused with the centrifugal pseudo-force experienced in a accelerated referenced ...

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33 views

Conservation of energy in vertical circular motion

Books usually use conservation of energy to solve problems in vertical circular motion. But, principle of conservation of energy for one particle is, If all the $n$ forces $\vec F_i ...
-1
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0answers
27 views

Force required to swing gate open/close

I need to know how to calculate the force required to swing the gate open / close. If it is moving straight, we can use f=ma, but how to calculate for swinging motion? When I open or close the gate, I ...
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2answers
30 views

Magnitude of Tension: Circular Motion [closed]

Please consider the following: A tennis ball connected to a string is spun around in a vertical, circular path at a uniform speed. The ball has a mass m = 0.165 kg and moves at v = 4.76 m/s. The ...
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0answers
31 views

Centripetal force at the pole is different from the equator

why is the centripetal acceleration in the poles and equator if different? I know that it's related to Equatorial budge. But what I don't get it is that the centripetal force is zero at the poles. ...
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1answer
31 views

Which object fall from the spinning surface first [closed]

A layer of mud is placed on a plate. The plate is rotated and the mud near the edge will leave the plate first compare to the mud near the centre when angular speed of the plate is slowly increased. ...
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1answer
51 views

Generation of artificial gravity by rotation

I have been trying hard to understand how Artificial Gravity is produced by Rotating a satellite around its own axis. Thus far, I have understood (probably wrong) that as a satellite is spun, walls ...
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0answers
20 views

Centrifugal Force vs Motion (inertia)

Could centrifugal force be appropriately described as motion (inertia)--rather than an (imaginary) force? Could such a change of perspective eliminate much of the common confusion?
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3answers
2k views

Weightlessness in Satellites

The following is written in my textbook as the reason for weightlessness felt in satellites: The gravitational pull is counterbalanced by the centripetal force. This introduces two problems: ...
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2answers
38 views

Cause of centripetal acceleration in a ring

Suppose a ring is rotating in space with an angular velocity $\omega .$ Then each element of the ring is having an acceleration of $m\omega^2 r$ ($r$ is the radius of the ring) but what force is ...
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2answers
40 views

Period of mass in circular motion [closed]

I've been trying for 4 days now to solve my physics lab assignment but now I'm starting to think there must be a mistake in the question. You know those rotating mass experiments where you have a mass ...
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1answer
45 views

Why do we only feel the centrifugal force?

After spending some time researching about the centrifugal force, I now understand that it is needed in a non-inertial reference frame for Newton's Laws to hold true. However, I don't understand why ...
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2answers
53 views

Why doesn't a particle in uniform circular motion fall into the centre? [duplicate]

If a object is in uniform circular motion, I know there is a acceleration directed radially inward. If that's the case, shouldn't there be a velocity radially inwards at some time. If that's true. Why ...
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1answer
96 views

What force does balance centripetal force if centrifugal force doesn't exist in reality?

Which force does balance centripetal force? For example if we are rotating a ball tied with a string then centripetal force is acting inwards. Then which force balances it. I thought it is the ...
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1answer
36 views

How fast will a ball travel if spun around with a string then released? [closed]

It may seem like a stupid question, but I was wondering: If a ball with a mass of 50 kg was rotated from a string with a radius of 10m and a velocity of 100 m/s how fast will it be travelling when ...
3
votes
1answer
79 views

Is it possible to tell which way a Universe is spinning?

Imagine a Universe spinning on the x-axis. So there is a centripetal directed away from the x-axis. According to General Relativity this is entirely equivalent to a non-spinning Universe with a ...
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1answer
25 views

How does static friction provide centripetal acceleration? [duplicate]

While reading about the motion of a car on a level road, I read that static friction provides centripetal acceleration? Please explain as simple as possible.
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2answers
45 views

Why do riders feel forced down into their seats at the bottom of the first drop on a rollercoaster?

I am trying to figure out what forces an $80.0kg$ rider travelling at $110.0km/h$ ($30.56m/s$) would experience when at the bottom of the first drop on a rollercoaster where the radius of the ...
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0answers
27 views

Storm in a teacup

The Beaufort scale defines storm as 24.5–28.4 m/s. Undoubtedly can you push air into a teacup at 26 m/s, but will anything (tea or otherwise) then remain in the teacup? In other words: Is it possible ...
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1answer
39 views

Centripetal Force [closed]

What is the size of the force required to cause a car of mass $1.75\times10^3$ kg to travel in constant circle of diameter $25.0\space m$ with a constant speed of $25.0 \space ms^{-1}$ ?
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2answers
54 views

Roller Coaster Physics

I am trying to figure out how to calculate the $g$-forces throughout a non-uniform corkscrew as well as the exiting velocity. Do you calculate each radius separately and each $g$-force separately ...
2
votes
2answers
65 views

How is direction of static friction not opposite in direction but perpendicular when dealing with centripetal forces?

I was trying to wrap my head around this solution, and the whole idea of a car moving around a level curve, how the friction supplies the centripetal force. But I still can't wrap my head around the ...
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0answers
57 views

Tension in a rod rotating about a fixed point

A rod of mass $m$ and length $l$ is rising about a fixed point in the ceiling with an angular velocity $\omega$ as shown in the figure. Now, on taking a small element on the rod, the net tension ...
23
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4answers
5k views

Why doesn't a spinning object in the air fall?

Let's say I have a ball attached to a string and I'm spinning it above my head. If it's going fast enough, it doesn't fall. I know there's centripetal acceleration that's causing the ball to stay in a ...
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1answer
70 views

Hammer Throw Forces

I have a hammer (7 kg) and chain (120 cm) that I'm using in an Olympic event. It's a special hammer with a built-in jet that can generate 400 Newtons of thrust. The exhaust of the jet is directed ...
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5answers
110 views

What is the proper vector form for the Gravity Formula?

We are familiar with the equation for calculating the velocity of an object in orbit given the central mass (or the mass given the orbital velocity): $$\frac{v^2}{r} = \frac{MG}{r^2}$$ I'm trying to ...
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3answers
57 views

Is Conservation of Energy maintained when the orbit of a rotating mass increases in diameter?

I read an example where someone was explaining how the law of conservation of energy does not have to be maintained within a rotating mass even though angular momentum is maintained. The given ...
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2answers
124 views

How to start an artificial gravity?

I understand how artificial gravity in space stations works. It is by normal force the wall exerts on the foot. But I wonder how to start it in the first place. I just learned about centrifugation ...
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4answers
123 views

Is the centripetal force a pseudo force? [duplicate]

So I'm having a bit of struggle understanding the origin of the centripetal force. Is the centripetal force a pseudo force? Somebody told me that both the centrifugal and the centripetal forces are ...
1
vote
1answer
164 views

Could a bladeless “Tesla Turbine” type air compressor be used as a high vacuum pump?

I have a wacky idea for a new vacuum pump, I'm trying to figure out why it shouldn't work. I'm interested in learning about Tesla Turbines, specifically when used in reverse as compressors or vacuum ...
0
votes
1answer
38 views

What happens to centripetal acceleration if you change speed while rounding a corner? [closed]

What happens to centripetal acceleration if you change speed while rounding a corner?
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3answers
67 views

Why is centripetal acceleration called acceleration

Centripetal acceleration has a direction towards the center of the rotating object and if the magnitude of the speed of rotation remains same, then why do we call it an centripetal acceleration? ...
1
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1answer
84 views

Spring rotated in uniform circular motion

Why does a spring stretch when rotated in uniform circular motion? The horizontal rod containing the massless spring(stiffness = k) and block of mass 'm' is rotated uniformly about point P. ...
0
votes
1answer
35 views

In a Dyson shell, could centripetal force act as gravity?

In a pure Dyson shell surrounding a non-moving star, with the shell rotating around the star, could the centripetal force of the shell act in some way similar to gravity toward the interior of the ...
2
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1answer
114 views

Centrifugal force on a pendulum

Why don't we consider the centrifugal force acting on the bob of a pendulum while drawing the Free Body Diagram of a pendulum? It's also a sort of circular motion.
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0answers
12 views

Direction of acceleration in an oscillating pendulum [duplicate]

Consider an oscillating pendulum hung from a rigid wall. Neglect air friction and all. What's the direction of its resultant acceleration? Radial, tangential or somewhere in between? It should be ...
2
votes
3answers
131 views

Is centripetal acceleration mandatory for circular motion?

If we consider a case where a closed circular wall is present, and inside the boundary, just adjacent to the inner wall, two particles are placed touching the surface of inner boundary such that the ...
2
votes
1answer
82 views

What force balances centripetal force of Earth in inertial frame of reference?

I understand that in a non-inertial frame of reference rotating with the Earth, an object at rest has a weight that is equal to mg. This mg is the vector addition of the centrifugal force and the true ...
1
vote
1answer
598 views

Centripetal force on a Ferris wheel

(This is a high school–level problem, so no air resistance, etc.) A person is sitting on a Ferris wheel of radius $r$ moving at a constant speed. What is the force from the seat acting on the ...
0
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1answer
47 views

Central Motion with a Logarithmic potential [closed]

A particle is moving under the influence of central force given by the potential: $$V(r)=\alpha \log(r)$$ I have to calculate the radius of corresponding orbit in terms of L(angular momentum) and ...
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0answers
28 views

Centripetal Force Doubt

I have'nt understood the solution that has been provided: Question: Solution : I did'nt understand the part where they stated that for the water to not fall out of the bucket, N>= 0 I'm a high ...
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0answers
21 views

Is it possible to figure out the centripetal acceleration?

Is it possible to figure out the centripetal acceleration when all you know is that a plane is moving with constant speed in a half circle, and the plane is tilted 40 degrees? A passenger on the plane ...
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1answer
89 views

Pair of Centripetal force

We often says, forces do exist in a pair...... So what must be the pair of centripetal force? Obviously centrifugal is not the pair, because it is fictitious force and describe in non inertial frame.
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2answers
153 views

Conditions for vertical circular motion

If a bob attached to a string is swinging in vertical circular motion, we say that the bob leaves the circular path when the tension in the string becomes zero, but even when tension becomes zero, ...
0
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1answer
47 views

Calculating the amount of g's on a car tire

I am trying to calculate how many g's are applied on a car tire during transit. What I recall from my previous physics knowledge is that the formula to calculate the centripetal force is : $$F = ...
0
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0answers
16 views

The ratio of equators radiuse to polar radius

I want to calculate (Re/Rp) where (Re) is the rediuse of earth in the equator and (Rp) is the rediuse of earth in poles. I want to use newtons laws, the eqution of gravity and centripetal force ...
0
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2answers
73 views

Which centripetal force equation should I use for centripetal motion in uniform magnetic field, and why?

So far I learn two equations, doing the same thing: $$F_c = m\frac{v^2}{r} = qvB$$ It leaves me undecided when a question asks "by what factor is the force increased when velocity is double". The ...
7
votes
4answers
1k views

Will the sea form a concave surface?

Without neglecting the fact that the earth is rotating, let us be in a ship (such that there is no relative motion between sea and ship) in a sea that surrounds the northern most or southern most ...
0
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1answer
54 views

Centrifugal force on objects rotating around Earth

Suppose two objects travel around the equator on Earth at the same speed, $v$, in opposite directions, where the speed $v$ is measured relative to the Earth's surface. Will they experience different ...
1
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5answers
207 views

Why does solving $\mu mg = m \frac{v^2}{r}$ give the *max* possible velocity?

So here is the standard problem setup of a car turning on an unbanked road: A 1000 kg car is going around a curve with radius 30 meters. If the coefficient of friction between the car's tires ...
4
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2answers
138 views

Intuitive explanation for why centripetal acceleration is $\frac{v^2}{r}$

There are several ways to write centripetal acceleration $$\frac{v^2}{r} = \omega^2 r = v \omega$$ Are there intuitive explanations for any of these three forms? For instance, I can sort of explain ...